Internal-combustion engine



, fl ifsjw Mar. 3. 1925.

1 1,528,002 J. WOLF INTERNAL COMBUSTION ENGINE Fil' d Ma rch .31, 1923 FIGni/ e was-6mg I l g WITNE$$E$ I Patented Mar. 3, 1925.

UNITED T S PATENT OFFICE.

JACOB WOLF, OF HALES CORNERS, WISCONSIN.

INTERNAL-COMBUSTION ENGINE.

Application filed March 31, 1923. Serial No. 629,025.

a description, reference being had to the accompanying drawings, which are a part of this specification.

The invention relates to internal combus tion engines, and more particularly to multicylinder engines.

The object of the invention is to simplify the construction of multicylinder engines and to reduce the cost of labor and material in their manufacture. By the present invention, in a four-cycle multicylinder engine having the same stroke and bore, that is, cubic displacement, the number of connecting rods and crank throws may be reduced to half of that of the usual engine, thereby simplifying the engine construction and reducing the amount of material and the labor cost for the engine, and more par ticularly the invention is designed to provide a six-cylinder multicylinder engine with a three-throw crank shaft and a single connecting rod for each pair of pistons connected to one of the throws of the crank shaft.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the con: clusion hereof.

In the drawing: Fig. 1 is an elevation view of an engine embodying the invention, parts being broken away and parts being shown in section; Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1; Fig. 3 is a detail top view of the cylinder-block.

The engine includes a plurality of combination chambers l, each of which is formed by a head 5 and a cylinder 6. The cylinders are preferably cast in block and the head is preferably a single casting and detachable from the cylinder-block. The upper half 7 of the crank case is preferably cast integral with the cylinders and con-- nected to the lower half 8. The multithrow crank shaft 9 is journalled in bearings 10, there being end bearings, and preferably a bearing between each crank-throw. Trunk pistons 11 work in each of the cylinders 6 and a forked connecting ,rod 12 has its forked portions operatively connected to the wristpins 13 of adjacent pistons 11 and its lower or big end 14 with its cap 15 con-- nected to one of the cranks or throws'of the crankshaft 9 in the usual manner.

An inlet valve 16 controls passage through a port 17 to each chamber 6 and an exhaust valve 18 passage of the products of combustion from each combustion chamber 6 to an exhaust port 19. Where the engine is using acarbureted mixture of air and gas as fuel, an inlet manifold, not shown, supplied with gaseous mixture from a carburetor, not shown, conducts it to a port 20 communicating with the ports 17 for adjacent combustion chambers. The valves may be of any suitable design and are here shown as springclosed poppet valves operated by cams 21 and 22 in the usual manner at-the proper time in the cycle, the cam shaft 23 being driven, in the four-cycle design here shown, at half speed from the crank shaft 9 in any suitable or well known manner. The valves for adjacent cylinders are so timed as to provide a cyclic difierence of 180 degrees between the events of the cycle in one cylinder and those of the adjacent cylinder so that when one of the pistons is moving down on the firing stroke the other piston connected to move with it is moving down on its suction stroke.

From the foregoing description it will be observed that for a six-cylinder engine I am able to use a three-throw crank shaft and to connect pairs of adjacent pistons together to the same connecting rod since when one of these pistons. is on the explosion stroke the other piston moving therewith is on the suction stroke, and by using this construction the number of parts is diminished and a saving in labor incident to their manufacture is effected.

' I desire it to be understood that this invention is not to be limited to the details of construction herein set forth except in so far as such limitations are specified in the claims.

What I claim as my invention is:

1. In a four-cycle multicylinder internal combustion engine, the combination of a plurality of pairs of combustion chambers, a cylinder forming part of each combustion chamber, a piston working in each cylinder, a multithrow crank shaft, asingle connecting rod connecting pistons together in pairs with each throw of said crank shaft, and inlet and exhaust valves for each cylinder, the operation of the valves for one cylinder having a difierence of 180 cyclic degrees,

2. In a six-cylinder four-cycle internalcombustion engine, the combination with the cylinders, piston working in each cylinder, a three-throw crank shaft, connecting rods opcratively connecting the pistons in pairs, respectively, to each throw of said crank shaft, and inlet and exhaust valvesfor each cylinder, the operation of the valves for one of the paired cylinders having a difference of 180 cyclic degrees from those of-the other cylinder so that when the piston rin the first named cylinder is on its firing stroke the adjacent piston moving therewith is on its suction stroke.

3. In a six-cylinder four-cycle internal combustion engine, the combination with the cylinders, a piston working in each cylinder, a. three-throw crank shaft an integrally forked connecting rod connecting a pair of pistonsto each throw of said crank shaft,

and inlet and exhaust valves for each cylinder, the operation of the valves for one of the paired cylinders having a difference of 180 cyclic degrees from those of the other cylinder so that when the piston in the first named cylinder is on its firing stroke the. ad aCent piston moving therewith is on its suction stroke.

In testimony whereof I afhx my slgnature.

JACOB /VOLF. 

